KR20100130006A - Apparatus and method for controlling sudden power off and data storage system using the same - Google Patents

Abstract

PURPOSE: A device and method for controlling sudden power off and a data storage system using the same are provided to perform a stable shut-off by normally finishing an ongoing operation in spite of sudden power off. CONSTITUTION: A device and method for controlling sudden power off comprises a backup power charging part(270-2) and a power distributor(270-3). The backup power charging part comprises a capacitor(C1), a first switch(SW1) and a second switch(SW2). The backup power charging part is charged by electricity supply in the normal time, but charged by the counter electro-motive force of the motor in unusual power supply.

Description

Apparatus and method for controlling sudden power off and data storage system using the same}

The present invention relates to a data storage device and a control method thereof, and more particularly, to a sudden power off control device and method in a data storage system.

In general, a data storage system is configured as a single storage device and is connected to a host device to store data or read data in accordance with a command of the host device. Recently, in order to increase storage capacity or improve data processing speed, a complex storage device including a plurality of storage devices has been developed.

There is a need for a technique for controlling a work to be completed normally even when a power supply is cut off while a single data storage device or a composite storage device is operating.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a sudden power-off control device that controls a normal operation to be completed when a supply power is abnormally cut off in a data storage device.

Another problem to be solved by the present invention is to provide a sudden power-off control method for controlling the operation to be completed normally when the power supply in the data storage device is abnormally cut off.

Another problem to be solved by the present invention is to provide a data storage system for controlling to terminate normally the operation being performed when the power supply is abnormally cut off.

Sudden power-off control device according to an embodiment of the present invention for achieving the above object is charged by the supply power in the state that the power is normally supplied, in the motor that rotates by inertia in the abnormally turned off power supply A preliminary power charging unit charged by the generated counter electromotive force and a power supply for selectively supplying power charged in the preliminary power charging unit to a circuit constituting the system based on an initially set priority condition when the supply power is abnormally turned off And a distribution unit.

The preliminary power charging unit includes a capacitor connected between a first node and ground, a first switch connected to one terminal of the power supply terminal, a first switch connected to the other terminal, and a motor connected to one terminal, And a second switch to which the first node is connected to the other terminal.

Preferably, the first switch is turned on while the power is supplied, and the second switch is designed to be turned on when the power supply is abnormally turned off.

According to another aspect of the present invention, there is provided a data storage system including a plurality of storage devices having different recording methods, a power supply unit supplying power to the plurality of storage devices, and a state in which power is normally supplied. A preliminary power charging unit that is charged by the power supplied from the power supply unit, charged by back electromotive force generated by a motor rotating by inertia when the power supply is abnormally turned off, and the power supply unit when power is normally generated. Power supplied from the power supply to the plurality of storage devices, and when the power supply is abnormally turned off, the power charged in the preliminary power charging unit may be selectively supplied to the plurality of storage devices based on an initial priority condition. And a power distribution unit for supplying It shall be.

The plurality of storage devices preferably include at least a hard disk drive and a solid state drive.

 The motor preferably includes a spindle motor for rotating a disk of a hard disk drive included in the plurality of storage devices.

Preferably, the priority condition is set to give priority to a storage device that is performing a read or write operation among the plurality of storage devices at a time when supply power is abnormally turned off.

Data storage system according to another embodiment of the present invention for achieving the another object is charged by the power supply in the state in which the spindle motor for rotating the disk, the power is normally supplied, in the abnormally turned off power supply A preliminary power charging unit charged by the counter electromotive force generated by the spindle motor, and a circuit for configuring a data storage device based on an initial priority condition in which power charged in the preliminary power charging unit is abnormally turned off. It characterized in that it comprises a power distribution to selectively supply to.

Sudden power off control method according to an embodiment of the present invention for achieving the another object is a step of determining whether the supply power is abnormally off in the system, and if the abnormal power supply is turned off as a result of the determination, And selectively supplying the preliminary charging power to circuits constituting the system based on the initially set priority.

The preliminary charging power preferably includes power charged by the supply power when the system is powered, and charged by the back EMF generated by the motor rotating by inertia when the power supply is abnormally turned off. .

According to the present invention, the preliminary electric power is charged using the back electromotive force generated from the motor rotating by the supply power or the inertia, and the supply power is supplied while the single data storage device or the complex storage device is operating using the charged preliminary power. Even when blocked, by normally finishing the operation being performed, the effect of performing a stable shut-off is generated.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings that illustrate preferred embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a configuration of a head disk assembly (HDA) 100 of a hard disk drive to which the present invention is applied. HDA 100 includes at least one magnetic disk 12 that is rotated by spindle motor 14. HDA 100 also includes a transducer (not shown) located adjacent to the disk surface.

The transducer can read or write information on the rotating disk 12 by sensing and magnetizing the magnetic field of each disk 12. Typically the transducer is coupled to each disk surface. Although described as a single transducer, it consists of a write transducer (aka writer) for magnetizing the disc 12 and a separate read transducer (aka reader) for sensing the magnetic field of the disc 12. It must be understood. Read transducers are constructed from Magneto-Resistive (MR) devices.

The transducer may be integrated into the magnetic head 16. The magnetic head 16 is structured to create an air bearing between the transducer and the disk surface. The magnetic head 16 is integrated in the head stack assembly (HSA) 22. The head stack assembly 22 is attached to an actuator arm 24 having a voice coil 26. The voice coil 26 is located adjacent to the magnetic assembly 28 to specify a voice coil motor 30 (VCM). The current supplied to the voice coil 26 generates a torque for rotating the actuator arm 24 relative to the bearing assembly 32. Rotation of the actuator arm 24 will move the transducer across the disk surface.

The information is typically stored in an annular track of the disc 12. Each track 34 generally includes a plurality of sectors. Each sector includes a data field and a servo field. In the servo field, a preamble, a servo address / index mark (SAM / SIM), a gray code, and a burst signal are recorded. The transducer is moved across the disk surface to read or write information on other tracks.

Then, a data storage system according to an embodiment of the present invention to which the HDA 100 as shown in FIG. 1 is applied will be described. Hereinafter, the data storage system according to the present invention will be described by dividing it into a case consisting of a single storage device and a case consisting of a plurality of storage devices.

First, a data storage system composed of a single storage device will be described with reference to FIG. 2. Here, the single storage device may be a hard disk drive as an example.

As shown in FIG. 2, a data storage system according to an embodiment of the present invention may include a pre-amp 210, a pre-amp, a read / write channel 220, an R / W channel, an HDD controller 230, and a voice. The coil motor driver 240 (VCM driver), the spindle motor driver 250 (SPM driver), and the sudden power-off control device 270 are provided.

The HDD controller 230 may be a digital signal processor (DSP), a microprocessor, a microcontroller, or the like. The HDD controller 230 reads information from or writes information to the disk 12 according to a command received from a host device (not shown in the drawing) through the host interface circuit 260. In order to control the read / write channel 220.

The HDD controller 230 is also coupled to a voice coil motor (VCM) driver 240 for supplying a driving current for driving the voice coil motor 30 (VCM). The HDD controller 230 supplies a control signal to the VCM driver 240 to control the movement of the magnetic head 16.

The HDD controller 230 is also coupled to a SPM (Spindle Motor) driver 250 that supplies a drive current for driving the spindle motor 14 (SPM). When power is supplied, the HDD controller 230 supplies a control signal to the SPM driver 250 to rotate the spindle motor 14 at a target speed.

In addition, the HDD controller 230 is coupled to the sudden power off control device 270, and the sudden power off control device 270 includes a power supply unit 270-1, a spare power charging unit 270-2, and a power distribution unit. 270-3.

The power supply unit 270-1 is a means for supplying power from the hard disk drive in a normal state. The preliminary power charger 270-2 is a means for supplying the preliminary power required to normally complete the operation performed by the hard disk drive in a state in which the power supplied from the power supply unit 270-1 is abnormally turned off. Detailed operations of the reserve power charging unit 270-2 will be described in detail with reference to FIG. 5 below. In addition, the power distribution unit 270-3 is a circuit required by the hard disk drive under the control of the HDD controller 230 by the power generated by the power supply unit 270-1 or the spare power charging unit 270-2. Means of dispensing. In particular, when the supply power is abnormally turned off, the power distribution unit 270-3 prioritizes the power charged in the reserve power charging unit 270-2 according to a control signal applied from the HDD controller 230. It distributes the data to the circuits that make up the data storage device based on the conditions. For reference, in FIG. 2, power lines are indicated by dotted lines.

The HDD controller 230 has a built-in memory, and the memory stores firmware and various control data for controlling the disk drive. Of course, program codes and information for executing the sudden power-off control method according to the present invention shown in FIG. 6 are stored.

First, the operation of a general disk drive will be described.

In the data read mode, the disc drive amplifies in the preamplifier 210 an electrical signal sensed by the magnetic head 16 from the disc 12. Then, the signal output from the preamplifier 220 is amplified and converted into a digital signal by an automatic gain control circuit which automatically varies the gain in accordance with the magnitude of the signal in the read / write channel 220 and then decodes it. To detect the data. The detected data is executed by the HDD controller 230 as an example using an Reed Solomon code, and then converted into stream data and transmitted to the host device through the host interface circuit 260.

Next, in the write mode, the disk drive receives data from a host device (not shown) through the host interface circuit 260, and the HDD controller 230 generates a parity symbol for error correction by the Reed Solomon code. After the encoding process is performed by the read / write channel circuit 220 so as to be suitable for the recording channel, the recording current is amplified by the preamplifier 210 and recorded on the disc 12 through the magnetic head 16.

Then, the sudden power off control device 270 will be described in more detail with reference to FIG. 5.

As illustrated in FIG. 5, the preliminary power charging unit 270-2 includes first and second switches SW1 and SW2 and a capacitor C1.

The capacitor C1 is connected between the first node Node 1 and ground. One terminal of the first switch SW1 is connected to the power supply terminal Vd, and the other terminal is connected to the first node Node1. One terminal of the second switch SW2 is connected to the spindle motor 14 to which the spindle motor SPM driving signal is applied, and the other terminal of the second switch SW2 is connected to the first node Node1.

The power supply terminal Vd is connected to one input terminal of the power distribution unit 270-3, and the output terminal Vds connected to the first node Node1 of the preliminary power charging unit 270-2 is connected to the other input terminal. Is connected.

Control signals CTL1 and CTL2 are applied to the first and second switches SW1 and SW2, and control signals CTL3 are applied to the power distribution unit 270-3. The control signals CTL1, CTL2, and CTL3 may be generated by the HDD controller 230 in the data storage system as shown in FIG. 2, and by the system controller 310 in the data storage system as shown in FIG. 3. Of course, it can also be designed to occur in other circuit configuration means constituting the data storage system.

In a state where the supply power is normally applied to the system, control signals CTL1 and CTL2 are generated to turn on the first switch SW1 and turn off the second switch SW2. Accordingly, the capacitor C1 is charged by the voltage of the power supply terminal Vd. Here, after the voltage of the capacitor C1 becomes equal to the voltage of the power supply terminal Vd, a control signal CTL1 having a logic value for turning off the first switch SW1 is generated. In some cases, even after the voltage of the capacitor C1 becomes equal to the voltage of the power supply terminal Vd, the turn-on state of the first switch SW1 is continuously maintained and power is abnormally supplied by the power supply unit 270-1. The logic value for turning off the first switch SW1 may be designed to generate the control signal CTL1 when the off state occurs.

In the state where the supply power is normally applied, the power distribution unit 270-3 distributes the power input from the power supply terminal Vd to the circuit constituting the data storage system through the output terminal Vo in accordance with the control signal CTL3. .

Next, when a state in which the power supply is abnormally turned off occurs, a control signal CTL1 having a logic value for turning off the first switch SW1 is generated. Of course, when the voltage of the capacitor C1 is designed to turn off after the voltage of the capacitor C1 becomes equal to the voltage of the power supply terminal Vd as described above, the logic state of the control signal CTL1 is the first state. The logic value for turning off the switch SW1 is maintained.

In addition, the power distribution unit 270-3 may set the charging power generated at the output terminal Vds connected to the first node Node1 of the preliminary power charging unit 270-2 according to the control signal CTL3 to the initial priority condition. Optionally supply to the circuit constituting the system.

A logic value for turning on the second switch SW2 at a specific timing in the process of selectively supplying the power charged by the redundant power charging unit 270-2 to the circuit constituting the system based on the initial priority condition is set. Generate a control signal CTL2. Accordingly, the capacitor C1 is recharged by the back electromotive force BEMF generated by the spindle motor 14 rotating by inertia after the supply power is turned off. In this case, the specific timing may be set to, for example, a time point at which the read / write remaining operation is finished using the power supplied by the preliminary power charger 270-2.

Then, the operation of the sudden power off control device 270 will be described again with reference to FIG. 2.

When the system is in a power-on state, power generated from the power supply unit 270-1 is supplied to a circuit constituting the system through the power distribution unit 270-3 to perform normal operation. The preliminary power charger 270-2 is charged by the power generated by the power supply unit 270-1.

If the power supply is abnormally turned off while the system maintains the power ON state, the power distribution unit 270-3 initializes the power charged in the spare power charging unit 270-2 under the control of the HDD controller 230. Supply selectively to the circuits that make up the system based on the set priority conditions. Here, the state in which the power supply is abnormally turned off while the system maintains the power ON state may be determined by monitoring whether the power supply voltage is lowered below the threshold level in the power ON state. In addition, if the initial priority condition is to perform a read / write operation at the time when the system is abnormally powered off while the system is kept in the power-on state, the priority priority is set to the circuit for finishing the read / write operation. The power charged in the preliminary power charging unit 270-2 is supplied. As an example, in this case, the backup power may be designed to supply only the HDD controller 230 and the read / write channel 220, and in some cases, the preamplifier 210, the read / write channel 220, and the HDD. The controller 230 may be designed to be supplied to the controller 230 and the read / write channel 220. It is a matter of course that the range of the circuit to be supplied can be determined differently according to the charging capacity of the backup power.

The HDD controller 230 controls to finish the read / write operation that was being performed.

After finishing the read / write operation, the HDD controller 230 recharges the preliminary power charging unit 270-2 by using the counter electromotive force generated in rotation by inertia in the spindle motor 14, and the preliminary power charging unit ( Power generated from the 270-2 is applied to the voice coil motor 30 to control the head stack assembly 22 on which the magnetic head 16 is mounted. Of course, in this case, it is effective to design the spare power supply only to the voice coil motor 30 and not to supply other circuits.

Next, a data storage system composed of a plurality of storage devices will be described with reference to FIG. 3. As an example, a data storage system consisting of two storage devices will be described.

As illustrated in FIG. 3, a data storage system according to another embodiment of the present invention is configured of a host device 1000 and a complex storage device 2000.

In detail, the complex storage device 2000 includes a host interface 260, a system controller 310, a first storage device 320, a second storage device 330, and a sudden power off control device 270.

Here, the system controller 310 is composed of a central processing unit (CPU) 310-1 and a memory 310-2. The central processing unit 310-1 is a means for collectively controlling a data storage system including a plurality of storage devices. The central processing unit 310-1 is a means for controlling a series of processes such as interpreting an instruction, calculating and comparing data. The memory 310-2 stores programs and data necessary for controlling the data storage system, and in particular, programs and data for executing the flowchart of FIG. 6 are also stored.

The first storage device 320 and the second storage device 330 are nonvolatile storage devices that do not lose data stored in the recording medium even when the power is cut off. The recording methods of the first and second storage devices are different. In an embodiment of the present invention, the first storage device 320 is implemented as a hard disk drive, and the second storage device 330 is implemented as a solid state drive (SSD). In an embodiment of the present invention, for convenience of description, the storage device 2 includes two storage devices, but the present invention is not limited thereto and is designed to include three or more storage devices. Of course it is possible.

For example, the second storage device 330 may be implemented as a flash nonvolatile memory, a phase change RAM (PRAM), a ferroelectric RAM (FRAM), a magnetic RAM (MRAM), or the like.

As an example, the host interface 260 performs data transmission / reception processing with the host device 1000 according to an integrated drive electronics (IDE) interface standard. In the present invention, data transmission / reception is performed with a plurality of storage devices included in the composite storage device 2000 through a single host interface 260.

The central processing unit 310-1 of the system controller 310 integrates the first storage device 320 and the second storage device 330 included in the complex storage device 2000 into a single storage device to form a logical block address. (Logical Block Address) and control to access the storage devices based on the assigned logical block address. In addition, the first storage device 320 and the second storage device 330 may be reported to the host device 1000 as a single storage device. Of course, logical block addresses may be assigned to independent separate storage devices and reported to multiple storage devices.

The sudden power-off control device 270 includes a power supply unit 270-1, a reserve power charging unit 270-2, and a power distribution unit 270-3.

The power supply unit 270-1 is a means for supplying power from the complex storage device 2000. The preliminary power charging unit 270-2 is a means for supplying power necessary for normally finishing an operation being performed in the complex storage device 2000 when the power supplied from the power supply unit 270-1 is abnormally turned off. Since the preliminary power charging unit 270-2 has already been described in detail with reference to FIG. 5, the redundant description will be omitted.

The power distribution unit 270-3 is a circuit that requires the power generated by the power supply unit 270-1 or the preliminary power charging unit 270-2 to the complex storage device 2000 under the control of the system controller 310. Means to dispense. In particular, when the supply power is abnormally turned off, the power distribution unit 270-3 prioritizes the power charged in the reserve power charging unit 270-2 according to a control signal applied from the system controller 310. Based on a condition, the first storage device 320 or the second storage device 330 is distributed to a circuit constituting the second storage device 330. For reference, in FIG. 3, power lines are indicated by dotted lines.

4 is a detailed configuration diagram when the first storage device 320 and the second storage device 330 are set as a hard disk drive (HDD) and a solid state drive (SSD), respectively, in the data storage system shown in FIG. 3. to be.

As shown in FIG. 4, the first storage device 320 includes a buffer 1 320-1, an HDD controller 320-2, a read / write channel circuit 320-3, and a voice coil. The motor (VCM) driver 240, the spindle motor (SPM) driver 250, and the head disk assembly (HDA) 100 are configured, and the second storage device 330 is the buffer 2 330-1 and the SSD controller. 330-2 and nonvolatile (NV) memory 330-3. For reference, in FIG. 4, power lines are indicated by dotted lines. Here, the read / write (R / W) channel circuit 320-3 includes a preamplifier.

Since the detailed configuration of the head disk assembly 230-5 has been described in detail with reference to FIG. 1, redundant description will be avoided. Next, the data read and data write operations in the data storage system under the control of the system controller 310 will be described.

First, the read mode operation will be described.

When the read command is received through the host interface 260, the system controller 310 stores the logical block addresses specified in the received read command by referring to the LBA allocation information stored in the complex storage device. Determine which storage device is allocated among the devices.

When the logical block addresses specified in the read command are allocated to the hard disk drive which is the first storage device 320, the system controller 310 selects the hard disk drive to execute the data read mode.

That is, the HDD controller 320-2 calculates the CHS value corresponding to the logical block address specified by the read command with reference to the LBA allocation information, and uses the magnetic head as the target track of the disk 12 corresponding to the calculated CHS value. Control signals for moving 16 are output to the VCM driver 240.

The SPM driver 250 generates a driving current applied to the spindle motor 14 that rotates the disk 12 based on control signals input from the HDD controller 320-2.

When the magnetic head 16 reaches the target track, the read / write channel circuit reads an electrical signal read from the sector position of the target track of the disc 12 by the selected magnetic head 16 based on the calculated CHS value. After amplifying at 320-3 and encoding the digital signal, the signal is converted into stream data and stored in the buffer 1320-1. Thereafter, the system controller 310 sequentially reads data stored in the buffer 1 320-1 and transmits the data to the host device through the host interface 260.

If the logical block addresses specified in the read command are allocated to the solid state drive SSD which is the second storage device 330, the system controller 310 selects the SSD to execute the data read mode.

That is, the SSD controller 330-2 calculates a physical memory block number (PBN) mapped to a logical block address designated by a read command with reference to the LBA allocation information, and the NV memory corresponding to the calculated physical memory block number ( The data stored in the storage location of the storage device 330-3 is read out and stored in the buffer 2 330-1. Thereafter, the system controller 310 sequentially reads data stored in the buffer 2 330-1 and transmits the data to the host device through the host interface 260.

Next, the write mode operation will be described.

When the write command is received through the host interface 260, the system controller 310 stores the logical block addresses specified in the received write command by referring to the LBA allocation information stored in the composite storage device. Determine which storage device is allocated from the device.

When the logical block addresses specified in the write command are allocated to the hard disk drive that is the first storage device 320, the system controller 310 selects the hard disk drive to execute the data write mode.

Accordingly, the HDD controller 320-2 calculates a CHS value corresponding to the logical block address designated by the write command by referring to the LBA allocation information, and then sleeps the target track of the disk 12 corresponding to the calculated CHS value. Control the head 16 to move.

Then, after temporarily storing the data received through the host interface 260 in the buffer 1 (320-1), the data sequentially from the buffer 1 (320-1) under the control of the HDD controller 320-2 Is read and output to the read / write channel circuit 320-3. Then, the read / write channel circuit 320-3 converts the binary data stream suitable for the recording channel of the disc 12, converts it into a recording current, and writes the disc 12 through the magnetic head 16.

If the logical block addresses specified in the write command are allocated to the SSD which is the second storage device 330, the system controller 310 selects the SSD to execute the data write mode.

That is, the SSD controller 330-2 calculates a physical memory block number PBN mapped to a logical block address designated by a write command with reference to the LBA allocation information.

Data received through the host interface 260 is temporarily stored in the buffer 2 330-1. Then, the data is sequentially read from the buffer 2 330-1 under the control of the SSD controller 330-2, and the read data is the NV memory 330-3 corresponding to the physical memory block number calculated above. Write to the storage location of.

Next, the operation of the sudden power-off control device 270 will be described.

When the data storage system is in a power on state, the power distribution unit 270-3 may supply power generated from the power supply unit 270-1 to the first storage device 320 and the second storage device ( 330). The preliminary power charging unit 270-2 is charged using power generated by the power supply unit 270-1. A detailed circuit configuration of the spare power charging unit 270-2 is illustrated in FIG. 5 described above.

If the power generated from the power supply unit 270-1 is abnormally turned off while the data storage system is powered on, the system controller 310 controls the power distribution unit 270-3 to supply the power supply unit. Instead of the power generated in operation 270-1, the power charged in the preliminary power charging unit 270-2 is selectively supplied to a circuit constituting the complex storage device based on an initial set priority condition as follows.

 First, when only the HDD, which is the first storage device 320, of the complex storage device is operating when the power is abnormally turned off, the preliminary power charging unit 270-2 is charged under the control of the system controller 310. The supplied power is supplied only to the HDD which is the first storage device 320. In addition, the system controller 310 transmits a command for finishing the current operation to the HDD controller 320-2 to control the read or write operation being performed on the HDD. When the read or write operation is completed, the system controller 310 uses the back EMF generated by inertia in the spindle motor included in the head disk assembly 100 to use the reserve power charging unit 270-2. Control to recharge. In addition, the HDD controller 320-2 controls to park the head stack assembly with the power recharged by the preliminary power charging unit 270-2.

Second, when only the SSD, which is the second storage device 330, of the complex storage device is operating when the power is abnormally turned off, the charged power to the preliminary power charging unit 270-2 is supplied only to the SSD. In addition, the system controller 310 transmits a command to finish the running operation to the SSD controller 330-2 to control the read or write operation being performed by the SSD 330. As an example, when the write operation is being executed, meta data indicating a structure of data is stored in the NV memory 330-3 by using the power charged in the preliminary power charging unit 270-2. Finish the light action.

Third, when the power source is abnormally turned off when the HDD of the first storage device 320 and the SSD of the second storage device 330 are simultaneously operated as follows.

First, the system controller 310 controls the SSD to store meta data in the NV memory 330-3 by using the power charged in the preliminary power charger 270-2 and finishes the write operation. .

Next, the system controller 310 controls to recharge the preliminary power charging unit 270-2 by using back electromotive force generated by inertia in the spindle motor included in the head disk assembly 100 of the HDD. In addition, the HDD controller 320-2 controls to park the head stack assembly with the power recharged by the preliminary power charging unit 270-2.

Next, a sudden power off control method according to an embodiment of the present invention will be described with reference to FIG. 6.

First, the system is powered on (POWER ON) to supply power to the data storage system (S601). The data storage system includes, by way of example, a hard disk drive. Of course, the hard disk drive and the recording method may include a plurality of storage devices different from each other.

When power is supplied to the system, the supply power is connected to the charging device to charge the reserve power (S602).

Next, it is determined whether the power supply is abnormally off while the system is powered on (S603). The state in which the supply power is abnormally turned off while the system is in the power on state can be determined by monitoring whether the power supply voltage is lowered below the threshold level in the power on state.

As a result of the determination in step 603 (S603), when the supply power is abnormally turned off while the system is powered on, the spare power charged in step 602 (S602) is supplied to the circuit constituting the system based on the initial set priority. Allocating and executing the remaining command using the reserve power (S604). As an example, if a system is executing a read or write operation, priority may be set to provide the first priority to supplying reserve power to a circuit required for finishing the executing read or write operation. Accordingly, in a data storage system including a plurality of storage devices, the preliminary power is preferentially supplied to the storage device that is performing the read or write operation at an abnormally off time, and the read or write operation that is being performed using the reserve power is performed. To finish.

Next, it is determined whether the lead or light remaining operation using the charged spare power is completed (S605).

When the read or write remaining operation is completed as a result of the determination in step 605 (S605), the backup power is recharged by using the counter electromotive force generated by the motor rotating by inertia in the data storage system (S606). Here, the motor generating back electromotive force by inertia includes the spindle motor of the hard disk drive.

Then, the head stack assembly of the hard disk drive is parked using the recharged spare power (S607).

In the present invention, the preliminary power recharge may be designed to be started in the middle of performing a read or write residual operation.

The invention can be practiced as a method, apparatus, system, or the like. When implemented in software, the constituent means of the present invention are code segments that necessarily perform the necessary work. The program or code segments may be stored in a processor readable medium.

Specific embodiments shown and described in the accompanying drawings are only to be understood as an example of the present invention, not to limit the scope of the invention, but also within the scope of the technical spirit described in the present invention in the technical field to which the present invention belongs As various other changes may occur, it is obvious that the invention is not limited to the specific constructions and arrangements shown or described.

1 is a plan view of a head disk assembly of a hard disk drive to which the present invention is applied.

2 is a block diagram of a data storage system according to an embodiment of the present invention.

3 is a block diagram of a data storage system according to another embodiment of the present invention.

4 is a detailed configuration diagram of FIG. 3.

5 is a configuration diagram of a sudden power off control apparatus according to another embodiment of the present invention.

6 is a flowchart of a sudden power off control method according to another embodiment of the present invention.

Claims (10)

A preliminary power charging unit that is charged by a supply power in a state in which power is normally supplied, and is charged by a counter electromotive force generated by a motor rotating by inertia in a state in which the power supply is abnormally turned off; And Sudden power-off control, characterized in that it comprises a power distribution unit for selectively supplying the power charged in the spare power charging section to the circuit constituting the system in the case of abnormally supply power is turned off Device. The method of claim 1, wherein the spare power charging unit A capacitor connected between the first node and ground; A first switch connected to one terminal of the power supply terminal and the first node to another terminal; And And a second switch to which the motor is connected to one terminal and the first node is connected to the other terminal. The apparatus of claim 2, wherein the first switch is turned on in a state in which power is supplied, and the second switch is turned on in a state in which supply power is abnormally turned off. A plurality of storage devices having different recording methods; A power supply unit supplying power to the plurality of storage devices; A preliminary power charging unit that is charged by power supplied from the power supply unit in a state in which power is normally supplied, and charged by back electromotive force generated from a motor rotating by inertia in a state in which the power supply is abnormally turned off; And In a state in which power is normally generated, power output from the power supply unit is supplied to the plurality of storage devices, and in a state in which power supply is abnormally turned off, power charged in the preliminary power charging unit is based on an initial set priority condition. And a power distribution unit selectively supplying the plurality of storage devices. 5. The data storage system of claim 4, wherein the plurality of storage devices includes at least a hard disk drive and a solid state drive. The data storage system of claim 4, wherein the motor comprises a spindle motor that rotates a disk of a hard disk drive included in the plurality of storage devices. The data storage system of claim 4, wherein the priority condition is set to supply first to a storage device that is performing a read or write operation among the plurality of storage devices at a time when abnormally supply power is turned off. A spindle motor for rotating the disk; A preliminary power charging unit that is charged by the supply power in a state where power is normally supplied, and charged by back electromotive force generated by the spindle motor in an abnormally turned off state; And And a power distribution unit selectively supplying power charged in the preliminary power charging unit to a circuit constituting a data storage device based on an initial priority condition when the supply power is abnormally turned off. system. Determining whether the supply power is abnormally turned off in the system; And And selectively supplying preliminary charging power to a circuit constituting a system based on an initially set priority when the supply power is abnormally turned off as a result of the determination. 10. The method of claim 9, wherein the preliminary charging power is charged by the supply power when the power is supplied to the system, the power is charged by the back electromotive force generated by the motor rotates by inertia when the supply power is abnormally off Sudden power off control method characterized in that it comprises a.

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